/Engine/Plugins/Experimental/MeshModelingToolsetExp/Source/MeshModelingToolsExp/Public/MeshSelectionTool.h
enum EMeshSelectionToolPrimaryMode { Brush, VolumetricBrush, AngleFiltered, Visible, AllConnected, AllInGroup, ByMaterial, ByMaterialAll, ByUVIsland, AllWithinAngle, }